International comfort products PH4E Series Installation Instructions Manual page 22

R−410A QUICK REFERENCE GUIDE
S R−410A refrigerant operates at 50−70 percent higher pressures than R−22. Be sure that servicing equipment and
replacement components are designed to operate with R−410A
R−410A refrigerant cylinders are rose colored.
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S Recovery cylinder service pressure rating must be 400 psig (2758 kPa), DOT 4BA400 or DOT BW400.
S R−410A systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold
hose when charging into suction line with compressor operating
S Manifold sets should be minimum 700 psig (4826 kPa) high side and 180 psig (1241 kPa) low side with 550 psig
(3792 kPa) low−side retard.
Use hoses with minimum 700 psig (4826 kPa) service pressure rating.
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S Leak detectors should be designed to detect HFC refrigerant.
S R−410A, as with other HFCs, is only compatible with POE oils.
S Vacuum pumps will not remove moisture from oil.
S Do not use liquid−line filter driers with rated working pressures less than 600 psig (4137 kPa).
S Do not leave R−410A suction line filter driers in line longer than 72 hours.
S Do not install a suction−line filter drier in liquid line.
S POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
S POE oils may cause damage to certain plastics and roofing materials.
S Wrap all filter driers and service valves with wet cloth when brazing.
S A factory approved liquid−line filter drier is required on every unit.
Never open system to atmosphere while it is under a vacuum.
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S When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and
replace filter driers. Evacuate to 500 microns prior to recharging.
Do not vent R−410A into the atmosphere.
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S Observe all warnings, cautions, and bold text.
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